/* 轮播图 */
.banner{
    background-color: #F5F5F5;
    width: 100%;
    height: 280px;
}
.banner #banner-box ul li img{
    width: 100%;
    height: 300px;
}
#banner-box {
    position: relative;
    cursor: pointer;
    margin: 0 auto;
}
#pic li {
    top: 0;
    left: 0;
    z-index: 1;
}

#num {
    position: absolute;
    z-index: 2;
    bottom: 20px;
    left: 45%;
}
#num li {
    float: left;
    width: 15px;
    height: 15px;
    margin: 5px 10px;
    border-radius: 50%;
    border: 1px solid #FFFFFF;
    line-height: 20px;
    background: transparent;
    text-align: center;
}
#num li.active {
    background:  #fefefe;
}

.arrow {
    z-index: 3;
    height: 70px;
    width: 50px;
    position: absolute;
    top: 45%;
    line-height: 70px;
    background: rgba(220, 218, 218, 0.3);
    text-align: center;
    font-size: 25px;
    display: none;
}
#banner-box:hover .arrow {
    display: block;
    /* transform: translateX(); */
    /* transition: 0.5s; */
}
.arrow:hover {
    background: rgba(166, 164, 164, 0.7);
    color: white;
}
#left {
    left: 0;
}
#right {
    right: 0;
}